//
// "$Id: Fl_Pack.cxx 8864 2011-07-19 04:49:30Z greg.ercolano $"
//
// Packing widget for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2010 by Bill Spitzak and others.
//
// This library is free software. Distribution and use rights are outlined in
// the file "COPYING" which should have been included with this file.  If this
// file is missing or damaged, see the license at:
//
//     http://www.fltk.org/COPYING.php
//
// Please report all bugs and problems on the following page:
//
//     http://www.fltk.org/str.php
//

// Based on code by Curtis Edwards
// Group that compresses all it's children together and resizes to surround
// them on each redraw (only if box() is zero)
// Bugs: ?

#include "Fl.H"
#include "Fl_Pack.H"
#include "fl_draw.H"

/**
  Creates a new Fl_Pack widget using the given position, size,
  and label string. The default boxtype is FL_NO_BOX.
  <P>The destructor <I>also deletes all the children</I>. This allows a
  whole tree to be deleted at once, without having to keep a pointer to
  all the children in the user code. A kludge has been done so the
  Fl_Pack and all of it's children can be automatic (local)
  variables, but you must declare the Fl_Pack<I>first</I>, so
  that it is destroyed last.
*/
Fl_Pack::Fl_Pack(int X, int Y, int W, int H,const char *l)
	: Fl_Group(X, Y, W, H, l)
{
	resizable(0);
	spacing_ = 0;
	// type(VERTICAL); // already set like this
}

void Fl_Pack::draw()
{
	int tx = x()+Fl::box_dx(box());
	int ty = y()+Fl::box_dy(box());
	int tw = w()-Fl::box_dw(box());
	int th = h()-Fl::box_dh(box());
	int rw, rh;
	int current_position = horizontal() ? tx : ty;
	int maximum_position = current_position;
	uchar d = damage();
	Fl_Widget*const* a = array();
	if (horizontal()) {
		rw = -spacing_;
		rh = th;

		for (int i = children(); i--;)
			if (child(i)->visible()) {
				if (child(i) != this->resizable()) rw += child(i)->w();
				rw += spacing_;
			}
	} else {
		rw = tw;
		rh = -spacing_;

		for (int i = children(); i--;)
			if (child(i)->visible()) {
				if (child(i) != this->resizable()) rh += child(i)->h();
				rh += spacing_;
			}
	}
	for (int i = children(); i--;) {
		Fl_Widget* o = *a++;
		if (o->visible()) {
			int X,Y,W,H;
			if (horizontal()) {
				X = current_position;
				W = o->w();
				Y = ty;
				H = th;
			} else {
				X = tx;
				W = tw;
				Y = current_position;
				H = o->h();
			}
			// Last child, if resizable, takes all remaining room
			if(i == 0 && o == this->resizable()) {
				if(horizontal())
					W = tw - rw;
				else
					H = th - rh;
			}
			if (spacing_ && current_position>maximum_position && box() &&
			    (X != o->x() || Y != o->y() || d&FL_DAMAGE_ALL)) {
				fl_color(color());
				if (horizontal())
					fl_rectf(maximum_position, ty, spacing_, th);
				else
					fl_rectf(tx, maximum_position, tw, spacing_);
			}
			if (X != o->x() || Y != o->y() || W != o->w() || H != o->h()) {
				o->resize(X,Y,W,H);
				o->clear_damage(FL_DAMAGE_ALL);
			}
			if (d&FL_DAMAGE_ALL) {
				draw_child(*o);
				draw_outside_label(*o);
			} else update_child(*o);
			// child's draw() can change it's size, so use new size:
			current_position += (horizontal() ? o->w() : o->h());
			if (current_position > maximum_position)
				maximum_position = current_position;
			current_position += spacing_;
		}
	}

	if (horizontal()) {
		if (maximum_position < tx+tw && box()) {
			fl_color(color());
			fl_rectf(maximum_position, ty, tx+tw-maximum_position, th);
		}
		tw = maximum_position-tx;
	} else {
		if (maximum_position < ty+th && box()) {
			fl_color(color());
			fl_rectf(tx, maximum_position, tw, ty+th-maximum_position);
		}
		th = maximum_position-ty;
	}

	tw += Fl::box_dw(box());
	if (tw <= 0) tw = 1;
	th += Fl::box_dh(box());
	if (th <= 0) th = 1;
	if (tw != w() || th != h()) {
		Fl_Widget::resize(x(),y(),tw,th);
		d = FL_DAMAGE_ALL;
	}
	if (d&FL_DAMAGE_ALL) {
		draw_box();
		draw_label();
	}
}

//
// End of "$Id: Fl_Pack.cxx 8864 2011-07-19 04:49:30Z greg.ercolano $".
//
